Calculating Velocity in a Pipe: Flow Rate 0.01, Diameter 90mm

[fowler2k]

I need to find the velocity within a pipe , I know the flow rate and diameter

Flow rate =0.01
Diameter =90mm

Am I correct in thinking to use V =Q/A

Where A is found using A=pi/4 x D^2

Using this I got A =0.0064m but somehow this does not seem quite right to me

Can anybody please tell me where I am going wrong please

Thanks

 

[SteamKing]

Please include units for all quantities. How else can we tell what these numbers mean?

 

[fowler2k]

0.01m3 s-1

 

[billy_joule]

I need to find the velocity within a pipe , I know the flow rate and diameter

Flow rate =0.01
Diameter =90mm

Am I correct in thinking to use V =Q/A

Where A is found using A=pi/4 x D^2

Using this I got A =0.0064m but somehow this does not seem quite right to me

Yes, it's not quite right. Your answer is a length...you want an area.

 

[fowler2k]

Ah so it should be m^2 ?

 

[JazzyJones]

What are the units for your flow rate?

And also, Your equation for area includes the term D^2 which implies the diameter is being squared, so your answer for area should have the units mm^2.